Electric motor-control system.



PATENTED OCT. 80, 1906.

W. COOPER, ELECTRIC MOTOROONTROL SYSTEM.

APPLICATION FILED MAY22.1905.

IINVENTOR WITNESSES: QC/L74 W i wittiai coornn, or WILKINSBURG, Pannier VANIA, as's cnoa TO wns'nncnousn ELECTRIC & MANUFACTURING COMPANY, A 0011- OF PENNSYLVANlA.

' I ELEcTmo MoToR-coNTRoL eve-rem.

No.834,5 613f 1 My invention relates'to'sys tems of electric motor'control, and has special reference to systems that are adapted for railway-service. :The object of my lnvention isto provide, in connection with anauxiliary control system, ;means forautomatically changing from a series connection of the motors of ,the equipment to'a multiple connection of said motors without involving; an increase or diminution of motor-currents.

Inithe prior art it has been customary in controlling a a two motor railway vehicle equipment to connect the motors in series with each other and with a predetermined resistance, ,thento gradually decreasethe resistance, then to connect the motors in multiple circuit with the resistance again inserted, and, finally, to gradually cut out tliel resistance. To accomplish this result in connection with an auxiliary control system and to utilize the same resistance Without applying excessive currents to the motors,

or no-current condition on the bridge-circuit when the circuit is automatically opened without causing. substantially any variation in the motor-currents.

Myinvention is illustrated in the accompanying drawings, in which- A Figure 1 is a diagrammatic view of a system constructed in accordance therewith, comprising, for. conveniencefa two-motor equipment governed byya hand-operated master-controller. Fig. 2 is a diagram of Specification of Letters Patent. 7 Application filed May 22,1905. Serial No. 261,616. 1

battery 4 a lurality of positions a, b, c, d, e,f, g,

a bridge-circuit 3 has been employed which, short-circuited the and resistance-sections 16, 17, and 15 successively short-circuited.

Patented Oct; 30, 1906. I

connections of the motors shown in Fig. 1 at the time when the connections are about to be changed from seriesto parallel relation.

I desire that my invention shall not be confined or restricted to any specific arrangement, for it may, and probably will, be applied to athree or afour motor .equi ment arranged for series and multiple operation in either direction and may embody either automatic acceleration or hand-operated master-switch control, asshown.

4 Referring to the drawings, direct-current electrical energy is supplied from a positive line-terminal 1 tea plurality of motors 2 and 3, which may be governed by anauxiliary system suppli d with energy from a storage and controlled by .ahand-operated' 7o master-switch 5, that may occupy any one of and h hen the master-controller 5 occu ies the position 0, energy is supplied from t e bat tery' 4, through contact-finger 6, contact-seg- 7 5 ment 7 contact-fingers 8 and 9, windings 10. and 11, to negative-battery line conduetoi' 12, -Ascurrent flows through the windings 10 and 11 switches 13 and 14 are closed, which completes the main circuit from the positive line-terminal 1, through switch- 14 the motor 2, a resistance member that is subdivided into sections 15'and16, the switch 13, another similar resistance member comprising sections the negative line conductor 19. Thus the two motors 2 .and 3 are connected in series across the line with the'entire resistance 15 16 17 18 in series with them.

As the master cont-roller 5 occupies succeso sively' the positions I), c, and d, the contactfingers 20, 21 ,and 22 are supplied with energy from the battery ,4, through contact-seg ment 7, which they successivelyengage, A circuit is completed from fingers 20, 21, and 5 22 through windings '23, 24, nd 2s, to the negative-battery lineconductor 12, by reason of which the switches 26, 27 and 28 are closed As the master-controller is moved to the position e a contact-finger 28 is brought into engagement with a segment 29 and energy is supplied through the finger 28 to the winding 29 of a solenoid-switch 30, the other terrni- 1o 5 'nal of the winding 29 being connected tovthe 17 and 18 and the motor 3 to negativahattery line conductor 12.- The en Under such conditions the current will all ergizing of the winding 2. closes the switch flow through the third and fourth paths and- 30; which completes a bridge-circuit from a the two motors will be connected in multiple terminal 31 of the motor to a terminal 32 of circuit across the line with a resistance momthe motor 3 and completely short-circuits all her in series with each one, and as no current 70 of the resistance-sections 16 17-18. The will flow through the conductor 41 this path fingers 8, 20, 21, and 22 are out of engagemay be broken without danger of arcing or meri with the segment 7 when the masterfluctuation ofmotor-currents.. This relation controlier 5 occupies position e, so that windof equivalent resistances may be diilicult to re huge 10, 28, 24, and 25 are deenergized and obtain in practice, but it will be readily seen the corresponding switches 13, 26, 27, and 28 that if the total resistance of the sections 15 are opened. V 16 17 18 is greater than that exerted by the The opening of the switch 13 divides the re-- motors 2 and 3 a certain amount of current .sistancememhers, leaving sections 15 and 16 will flow through the bridge-circuit 41 in one I noted to the motor 2 and sections 17 and direction, and if the resistance exerted by the connected to the motor 3. 1 sections '15 16 17 18 is less than that exerted As the master-controller 5 is moved to the by the two motors current will flow through position f energy is supplied through a con the bridge-circuit 41 in the opposite direction.

tact segment 33,which is connected with the In order to make use of this relation, there- .20 contact-segment 7, intactmi or 34, and sistance members may be so constructed as wmdings 35 and 36h; ugativeattery conto have a greater value than the resistance ductor 1-2. The energinii'ig of the windings exerted by the two motors and part of the re- 35 and 36 cioses the switches-37 and 38 and sistance may be cut out until its value heconneets a terminal 39 ofthe'resistanceseccomes'less than that of the two motors. As ag-tions 1516 with the negative line terminal 19 the resistance is cut out the current through 0 and the terminal 40 of the resistancesections the bridge-circuit 41 will pass through a zero 17 18 with positive line conductor 1. The value. 7

main motor-circuit connections at this point The switch 30 in the bridge-circuit 41 is are more simply illustrated in Fig. 2, the auxprovided with a second winding 44, which is 3,0 iliary control-circuits being omitted. connected in series with the circuit, so that -Reierring particularly to Fig. 2, fourpossiwhen once the switch 30 is closed by enerlJle paths from the positive line conductor 1 gi zing of the magnet-winding 29 the Windtn the: negative line conductor 19 are proing 44 is energized to retain the switch 30 in vided, one through motor 2,,the bridge-cirthe closed position as long as any current 33 cuit 41, in which the switch 30 is located, flowsthrough the circuit 41. As themasterroo and themotor 3 to conductor 19. in this controller 5 is moved to the position the path it is ob'vio'us'that the current will tend. finger 28 moves out of engagement Wllii the to flowthrough, the conductor 41 from the contact-segment 29, so that the h1idgeci1 terminal 31 to the terminal cuit 41 may not be opened until the currentr40 @second path is provided through a conflowing therethrough reaches a zero value, 'otoi 42, in. which the switch 38 is located, which is attained. by the reduction of the re- "du through resistance-sections 17 18, the bridgesistance, as hereinbefore explained. This circuit 41, resistanceseotions 1-5 16, and a reduction of the resistance is accomplished conductor 43, in which the switch 37 is loas the master-controller 5 moves to the posi- 4'5'cated. in this path it is evident that the tion 9, when contact-lingers 20 and 21 again no current tends to flow through the bridge-cirengage the contact-r-zcgnient 7 and supply suit 41from the terminal 32 of the motor 3 to energy to the magnct winilings and 24, the terminal 31 of the motorZ, which is oppowhich closes the switches 26 and 27 and site to the tendency of the flow in the first short-circuits the resistame-sections 16 and 5c path. 17, as hc'loirc. After this resistance is cut I15 A third path is provided from the conducout and the circuit 41 is opened the motors tor 1 through the motor 2, the resistance- 2 and 3 are connected in multiple circuit, the sections 15 16, and the conductor .43 to the resistance-section 15 being in series with the negative conductor 19, and a fourth path is motor 2 and resistancesection 18 in series 55 provided from the positive line 1, through with the motor 3. Then the mastcr-con-- rec oonductor42, resistance-sections. 17 18 and troller is moved to the position 7b, which is themo'tor 3 to the negative line conductor 19. the full runnii position for the cq' "mentis evident that if the resistance to the contact-finger .312 and the contact-i i .fiow of current. that is exerted by the motors I move into engagement with the ii 7 i. I 6o 25 and 3 when in operatioi'l is equal. to that ment 7 and energize the IIIZLgDQw..IiiklllflQS I2 5 which is exerted by the resistame-sections 15 2-5 and 46, closing the switches J8; and 47, i6 17 18 no current will flow through the which short-circuit the resistance-sections bridge-circuit 41 in either direction, since the 15 and 18, leavin r the motors directly across tendency to flow in one direction is equal to the line in parallel. ogthe tendency to flow in the other direction. l Variations in the details of devices and x 0 J in 3%.; vii, thermsfiih, succ'ss weiy .ammeatinsg; the as x161 with 1 Hi-i, rash; ma

Fling 61% skfies s0 flea-$5.0m 0a *rs when no mmuja", is fiawing i 2% ycentroi system. which g'c vzb u by maswier-cofitrfifler safegu- Ema time comectifins thgreb f mad the amount 1w 0'15? EJGS$$EQ$5 in 'eii'cuit therewith, ofgneans 05?- sumassiva y c oimacting the mQtOrs in wiyho" @sistmice, in parallel, s1 mm waastamse 11;. senes'vnth each, ma'vmg said slmuitane n3 bhe reof and 1:191:01 and when 110 q'uwem is i meaans for au'wmabicsbliy gemng s connectiml between the motors curxem'is flowing therai'bmu E121. 1h? mmbination mvith 2; p112 '&-ity of pxising & mastermcntro iler aid 2), "pluralifiy of uni" wita ims, of .mesms 01 changing the m0 0111 a series to a, multipla-circuit c011- necsien withoubinvolflng any variation of the mator curr'ents, that comprises a bridgecirsuit which comments the motors in enes 'wiahout resistance in circuit, and means for automa icslly ugwnng midbridge-circuit after multfi'la aonnations have been gemgglemd, win xresismnca in Wit-h f'each fiewing there 'alact-ric motors and a comm comv v In wsmmuny where-oi 1 hams hereunto sub scribed my name this ifith day of May, 1905 WILLIAM. GGQPER;

TWimesses C. E. BEDELL, 32mm! H-KNES. 

